27493197981 has 16 divisors (see below), whose sum is σ = 37348205760. Its totient is φ = 17986707200.

The previous prime is 27493197931. The next prime is 27493197989. The reversal of 27493197981 is 18979139472.

It is not a de Polignac number, because 27493197981 - 2⁶ = 27493197917 is a prime.

It is a super-2 number, since 2×27493197981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27493197989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 367251 + ... + 435728.

It is an arithmetic number, because the mean of its divisors is an integer number (2334262860).

Almost surely, 2^27493197981 is an apocalyptic number.

It is an amenable number.

27493197981 is a deficient number, since it is larger than the sum of its proper divisors (9855007779).

27493197981 is a wasteful number, since it uses less digits than its factorization.

27493197981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803196.

The product of its digits is 6858432, while the sum is 60.

The spelling of 27493197981 in words is "twenty-seven billion, four hundred ninety-three million, one hundred ninety-seven thousand, nine hundred eighty-one".